I haven't any problem frontier update but I can tell you that my signal bar improved significantly after the update. Used to have 1-2 bars now I have full bars.
weirdest problem post-OTA i've read about yet.
clear the gallery cache? maybe some Launcher you're using is prompting this app to open upon unlock?
wait, this isn't for a Thunderbolt---per your profile excerpt/summary--you're a dInc2 user.
forget i said anything...
but why are you posting in the Thunderbolt section?
I could be wrong but if you unlock the screen and it isn't at the home screen, try hitting the back arrow until it goes all the way back to the home screen and see what happens when you unlock it again. This happened to me once when I tried to start a text and it took me to my picture gallery. All I did was keep hitting the back arrow to home screen and it fixed it.
EDIT: Please know that I'm not smart at this stuff yet but this is what worked for me.